No. 422.] NEW AGRICULTURAL ANT FROM TEXAS. 87 
a few square rods — as to suggest that they may have been 
merely parts of a single colony. These nests were all under 
rather small flat stones, which were often located by following 
up the foraging workers as they trudged home slowly over the 
hot soil in the intense glare of the sun. The nest is a simple 
structure consisting of a few broad and very shallow surface 
chambers (134-3 inches in diameter) connected by one or two 
vertical or oblique galleries with a few chambers situated at 
lower levels in the soil. The superficial chambers always con- 
tained from about 34 to 24 of a teaspoonful of seeds, mostly, 
but not exclusively, from the grasses of the neighborhood. 
These seeds were all dry and unhusked, and hence of a very 
different appearance from those found in neighboring nests of 
Solenopsis geminata. This ant carefully shells its seeds and 
treats them in some singular manner, so that they all have a 
glistening yellow color like the ants themselves. Although I 
collected the Pogonomyrmex at different times of the year and 
excavated their entire nests, it was impossible to discover 
either the queens or the males. Even the larvae and pupe, 
found in great numbers in the chambers ot the nests June 
1-10 were all of the worker type. The specific description 
which follows is drawn therefore exclusively from the worker. 
This, however, can scarcely be confounded with the workers of 
any of the other North-American species of the genus. 
Pogonomyrmex imberbiculus n. sp. 
Worker: Length 4-4.8 mm. Color rich ferruginous red, legs somewhat 
paler, eyes and edges of mandibles black; hairs covering the body yel- 
lowish. Head quadrangular, scarcely longer than broad, its posterior 
margin hardly incised.  Mandibles sexdentate, the two apical teeth largest, 
blades traversed nearly their entire length by coarse longitudinal ridges. 
Clypeus subopaque, with longitudinal ruge separated by series of faint 
stria and provided with long, anteriorly projecting hairs. Antennal scape 
covered with faint longitudinal ridges. the hairs on its anterior surface sub- 
erect, on the posterior surface more appressed. Dorsal and lateral surfaces 
of head covered with coarse rugas, which are scarcely divergent behind and 
connected with one another by irregular transverse ridges; the areola thus 
enclosed are subglabrous, coarsely and confluently punctate. Hairs on the 
upper and lateral surfaces of the head short, erect, subobtuse. Lower sur- 
face of head more delicately longitudinally rugose, with somewhat longer 
